This document contains 135 multiple choice questions related to agrometeorology. The questions cover topics such as layers of the atmosphere, clouds, weather phenomena like hurricanes and cyclones, climatic zones, measurement of weather elements, and general meteorological concepts. Each question is followed by a one word answer.

1. CHANDRA SHEKHAR AZAD
UNIVERSITY OF AGRICULTURE & TECHNOLOGY KANPUR
MCQ OF AGROMETEOROLOGY
PAWAN SHAKYA
B.SC (HONS.) HORTi.

2. ONE WORD AND FILL IN THE BLANKS
 Q.1. Layer of Ozone is present in……….
 Ans. Stratosphere.
 Q.2. Number of Agro climatic Zones in Uttar Pradesh are
…………
 Ans: 7.
 Q.3 According to Planning Commission agroclimatic
region of the whole country has been divided into …….
 Ans: 15.
 Q.4. Movement of air occurs in the atmosphere up to
height of ………
 Ans: 10km

3.  Q.5. Vertical temperature decrease is called Lapse rate
and the normal lapse rate is………
 Ans: 6.5℃km.
 Q.6. The Process by which a cloud droplet first forms is..
 Ans: Condensation.
 Q.7. Clouds are classified and named according to their
latitude and …………
 Ans: form or appearance.
 Q.8. A Cumulus cloud is recognized mainly by its……………
 Ans: Obvious vertical dimension.

4.  Q.9. The approximate lifetime of a wave cyclone is……
 Ans: a few days to a week.
 Q.10. A tornado is a small, very intense example of
the……………
 Ans: Cyclone.
 Q.11. Tornadoes most often move toward what
direction?
 Ans: North East.
 Q.12. What type of cloud is most common in a
hurricane?
 Ans: Cumulonimbus.

5.  Q.13. What causes the winds of a hurricane to be so fast?
 Ans: very strong pressure gradient force.
 Q.14. The vertical motions that occur when the air is
unstable are termed as………
 Ans: Convection.
 Q.15. The Stability of an air layer refers to its tendency to
either sustain or suppress ……….
 Ans: vertical motions.
 Q.16. High clouds tops generally are limited by the height of
the ………
 Ans: Tropopause

6.  Q.17. The term “Latent” means ………
 Ans: Hidden.
 Q.18. Energy of motion is also known as ……………
 Ans: Kinetic Energy.
 Q.19. An increase in albedo would be accompanied
by………… in radiative equilibrium temperature.
 Ans: Decrease.
 Q.20. Charged particles from the sun that travel through
space at high speeds are called ……….
 Ans: Solar Wind

7.  Q.21. Sunlight passes through a thicker portion of the
atmosphere at ………
 Ans: Both sunrise and sunset.
 Q.22. The percentage of water vapor present in the air
compared to that required for saturation is the ………… Ans:
Relative Humidity.
 Q.23. The Name given to a liquid drop of dew that freezes
when the air temperature drops below freezing is ………………
 Ans: Frozen dew.
 Q.24. A dim, “Watery” sun visible through a gray sheet like
cloud layer is often a good indication of………… Clouds.
 Ans: Altostratus

8.  Q.25. The unit of pressure most commonly found on a
surface weather map is ………………
 Ans: Millibars (mb) or hectopascals.
 Q.26. The transfer of heat by molecule to molecule
contact is ……………
 Ans: Conduction.
 Q.27. The Combined albedo of the earth and the
atmosphere is approximately…… percent.
 Ans: 30
 Q.28. Which cloud type would most likely from in
absolutely stable air?
 Ans: Stratus

9.  Q.29. Which cloud type would most likely form in an
unstable atmosphere?
 Ans: Cumulonimbus.
 Q.30. If rain falls on one side of a street and not on the
other side, the rain most likely fell from a ……………
 Ans: Cumulonimbus cloud.
 Q.31. The rate of the earth’s rotation determines the
strength of the………
 Ans: Coriolis force.
 Q.32. The first meteorological satellite was launched in
the year ………
 Ans: 1960.

10.  Q.33. Unit of wind is ……….
 Ans: Knot.
 Q.34. Unit of pressure is ………
 Ans: Millibar.
 Q.35. The cup anemometer rotates …………
 Ans: West to East
 Q.36. Quantum sensors used to measure ……………
 Ans: PAR (Photo synthetically active radiation).
 Q.37. Evapotranspiration is measured using …………
 Ans: Lysimeter.

11.  Q.38. The line joining the places having equal
temperature is called as …………
 Ans: Isotherm.
 Q.39. The line joining the places having equal
atmospheric pressure is called as………
 Ans: Isobar.
 Q.40. The line joining the place having equal amount of
rain fall is called as ……………
 Ans: Isohyet.
 Q.41. Evaporation is measured by……………
 Ans: USWB open pan Evaporimeter.

12.  Q.42. USWB stands for ………………
 Ans: United States Weather Bureau.
 Q.43. Hair hygrograph is an instrument used for
measurement of ………
 Ans: Relative Humidity (RH).
 Q.44. Sensor used in Quantum sensor is ……………
 Ans: Photodiode.
 Q.45. Sensor used in Albedometer is …………
 Ans: Thermopile.
 Q.46. NCMRWE Stands for ……………
 Ans: National Center for Medium Range Weather
Forecasting.

13.  Q.47. IMD Stands for……………
 Ans: India Meteorological Department.
 Q.48. IMD was established in ………………
 Ans: 1875.
 Q.49. WMO Stands for ……………..
 Ans: World Meteorological Organization.
 Q.50. WMO was formed in …………
 Ans: 1950.
 Q.51. India Standard time (IST) is calculated from the
longitude of………
 Ans: Allahabad.

14.  Q.52. Longitude of Allahabad is …………
 Ans: 82.50E.
 Q.53. Local time is also called as ……………
 Ans: Solar time.
 Q.54. …………… is called as Umbrella of the earth.
 Ans: Ozonosphere.
 Q.55. The Ozone layer was discovered in 1913 by the
French physicists …………………. & …………….
 Ans: Charles Fabry & Henri Buisson.
 Q.56. Total mass of atmosphere has been calculated as
about ……………
 Ans: 56 x 1014t.

15.  Q.57. Water Vapor controls…………… of the atmosphere.
 Ans: Temperature.
 Q.58. Blue color of the sky is due to ……………
 Ans: Rayleigh scattering.
 Q.59. The structure of earth is ……………
 Ans: Oblate ellipsoid.
 Q.60. The rotational speed of earth is maximum at……
 Ans: Equator.
 Q.61. The longest day of northern hemisphere is …………
 Ans: 21st June.

16.  Q.62. The shortest day of northern hemisphere is …………
 Ans: 22nd December.
 Q.63. The incoming solar radiation is known as ………………
 Ans: Insolation.
 Q.64. The imaginary line joining the places having equal
duration of sunshine hour is known as …………
 Ans: Isohel.
 Q.65. The value of solar constant is ……………
 Ans: 1398 watt/m2.
 Q.66. The radiation which lies in wavelength ranges from
0.4 to 0.7μm of solar spectrum is known as ………….
 Ans: Visible Radiation or Visible Light.

17.  Q.67. Albedo of Desert is ……………
 Ans: 28%.
 Q.68. Albedo of fresh snow is ……………
 Ans: 80-85%.
 Q.69. Albedo of water is ……………
 Ans: 6-9%.
 Q.70. The instrument used for measurement of long
wave radiation is ………
 Ans: Pyrgeometer.
 Q.71. Pyranometer is used for the measurement of …….
 Ans: Short wave radiation.

18.  Q.72. The instrument used for measurement of light
intensity is ……….
 Ans: Lux meter.
 Q.73. ITCZ stands for……………………
 Ans: Inter tropical Convergence Zone.
 Q.74. Horizontal movement of air is called as ……………
 Ans: Wind.
 Q.75. Vertical movement of air is called as ……………
 Ans: Air Current.
 Q.76. The trade wind belts lie between …… to ……
latitude in both hemispheres.
 Ans: 50 to 300.

19.  Q.77. The belt of westerlies between …… to …….. latitude in
each hemisphere.
 Ans: 300 to 600.
 Q.78. The pressure distribution between two high pressure
areas and two low pressure areas is called as………
 Ans: Col.
 Q.79…………………… is called as valley of low pressure.
 Ans: Trough.
 Q.80. The direction of winds depends upon the direction of
…………
 Ans: Pressure Gradient.
 Q.81. Both wind speed and wind direction is measured using
…………..
 Ans: Aero vane.

20.  Q.82. The line on weather map which joins the places
having equal wind speed is known as ………
 Ans: Isotach.
 Q.83………… state is called as gateway of India monsoon.
 Ans: Kerala
 Q.84…………… state receives most rainfall during N-E
Monsoon.
 Ans: Tamilinadu
 Q.85. The present level of CO2 is ……………
 Ans: 350 ppm.
 Q.86. The term ‘Acid rain’ was coined in 1872 by …………
 Ans: Robert Angus smith

21.  Q.87. The specific heat of water is ……………
 Ans: 1.0cal/gm/℃
 Q.88. Dry adiabatic lapse rate per kilometer is ……………
 Ans: 100C.
 Q.89. Wet adiabatic lapse rate of temperature per
kilometer is ……………
 Ans: 50C.
 Q.90. Summer monsoon over India is known as ……………
 Ans: South west monsoon.
 Q.91. The optimum temperature for germination of
most of the crops is ……
 Ans: 100C-270C.

22.  Q.92. Relative humidity is expressed is …………
 Ans: Percentage (%).
 Q.93. The mean height of the cirrus cloud is ……………
Ans: 4-6km.
 Q.94. Specific humidity is maximum at the ……………
 Ans: Equator.
 Q.95. Temperature inversion is found in ………… season.
 Ans: Winter.
 Q.96. For a white body, the emissivity and absorptivity is
……
 Ans: 0.

23.  Q.97. Frost occurs when the dew point is below……… 0C.
 Ans: 0.
 Q.98. Visible range of photosynthetically active radiation
extends between ………
 Ans: 400-700nm.
 Q.99. Specific heat of water is ………………
 Ans: 4.2×103 J/Kg/0C.
 Q.100. Average weather condition of a particular region
is called as ………
 Ans: Climate.

24.  Q.101. Condensation of water vapor over the surface is
called as ………
 Ans: Fog.
 Q.102. The germination of seed is induced by the light of
…… color.
 Ans: Red.
 Q.103. Instantaneous physical state of atmosphere is
called as ……….
 Ans: Weather.
 Q.104. The base temperature for wheat is ……
 Ans: 4.40C.
 Q.105. Which layer is known as region of mixing?
 Ans: Troposphere.

25.  Q.106. The surface temperature of the sun is estimated
between …… 0C to ….. 0C.
 Ans- 55000C to 61000C.
 Q.107……. gram calorie is the amount of heat to raise
the temperature of 1gm water by 10C.
 Ans- One gram.
 Q.108. The total amount of insolation received at the
equator is roughly about …… times that received at
either of the poles.
 Ans: Four.
 Q.109. Albedo of earth and its atmosphere is …………%.
 Ans: 35%.

26.  Q.110. Albedo of sand is …… %.
 Ans: 20-30%.
 Q.111. The decrease of temperature with increasing
altitudes in the atmosphere is called as ………………
 Ans: Vertical temperature gradient.
 Q.112. 1 mb = ………… Hectopascal.
 Ans: 1.
 Q.113. Total mass of the atmosphere has been
calculated as about ……… tons.
 Ans: 56×1014.
 Q.114. The mean value of solar constant is …………
 Ans: 1.98cal/cm2/minute.

27.  Q.115. The sensor used in quantum sensor is ……….
 Ans: Silicon Photo diode.
 Q.116 ……… is used for measurement of light intensity.
 Ans: Lux meter.
 Q.117. The belt of westerlies lies between …………. to ……
latitude in both hemispheres.
 Ans- 300 to 600.
 Q.118. Hadley cell is also called as ………… cell.
 Ans: Tropical.
 Q.119. The surface wind in Hadley cells are ……… winds.
 Ans: Trade.

28.  Q.120. The surface winds in ferrel cells are …………
 Ans: Westerlies.
 Q.121. The surface winds in polar cells are………
 Ans: Easterlies.
 Q.122. Coriolis force affects the………… distribution over
the globe.
 Ans: Pressure.
 Q.123. Pressure depends on the ………
 of air. Ans: Density.
 Q.124. The mean rate of decrease in pressure with
height is ……… per 100m.
 Ans: 1cm.

29.  Q.125. Dry adiabatic lapse rate of atmosphere is ………
 Ans: 100C/km.
 Q.126. Wet adiabatic lapse rate is …….
 Ans: 50C/km.
 Q.127. For transferring 1 gm of water into vapour about
………… calories are required.
 Ans: 600.
 Q.128…………… of two air masses is responsible for
change in weather.
 Ans: Interaction.
 Q.129. The wind in a cyclone rotate ……… in northern
hemisphere.
 Ans: Anticlockwise.

30.  Q.130. For formation of tropical cyclone, the sea surface
temperature should be >…… 0C.
 Ans: 27.
 Q.131……… force makes the air to bend.
 Ans: Coriolis force.
 Q.132. In a tropical cyclone, the eye has a diameter of …...
km.
 Ans: 40km.
 Q.133. Highest Coriolis force always at ………… and
minimum at ……….
 Ans: Poles, Equator
 Q.134……… fronts are responsible for development of
temperate cyclone.
 Ans: Polar.

31.  Q.135. Dew is not formed in ……… night.
 Ans: Windy.
 Q.136. The black frost is also called as ……… frost.
 Ans: Advection.
 Q.137. Clouds at lower or ground surface is called as ………
 Ans: Fog.
 Q.138. The process associated with formation of new
fronts is called as ………..
 Ans: Frontogenesis.
 Q.139. The destruction of fronts is called ………………
 Ans: Frontolysis.

32.  Q.140. Which front is formed when cold front overtakes
warm front and warm air is completely displaced from
the ground surface?
 Ans: Occluded front.
 Q.141. A low pressure with wind speed < 34 knots, the
system is called as……………
 Ans: Depression.
 Q.142. If wind speed>34 knots, then it is called as ………
 Ans: Cyclone.
 Q.143……………. is called as valley of low pressure.
 Ans: Trough.

33.  Q.144…………… is an extension of an anticyclone.
 Ans: Ridge.
 Q.145. The pressure distribution between two high
pressure areas and two low pressure areas is called as …
 Ans: Col.
 Q.146. Horizontal flow of air takes place along the ……
 Ans: Pressure Gradient.
 Q.147. The direction of wind mainly decided by direction
of ……
 Ans: Pressure Gradient.
 Q.148……… force causes air movement in the direction of
low pressure.
 Ans: Pressure Gradient.

34.  Q.149…………… force reduces wind velocity.
 Ans: Frictional.
 Q.150……… measures both wind speed and wind
direction.
 Ans: Aero vane.
 Q.151. The temperature at which condensation of water
vapour starts is called as…....
 Ans: Dew point.
 Q.152. Visible aggregate of liquid water droplets and ice
crystals suspended in the air is called as ………….
 Ans: Cloud.

35.  Q153………………. clouds generally do not give
precipitation.
 Ans: Cirrus.
 Q.154……………… clouds have rounded tops like dome or
cauliflower with flat base.
 Ans: Cumulus.
 Q.155. If any cloud associated with rain fall then we prefix
……… to its form.
 Ans: Nimbus.
 Q.156………… cloud produces halo phenomena around sun
and moon which is resulted from refraction of light.
 Ans: Cirrostratus.

36.  Q157…………… clouds responsible for corona phenomena
around sun and moon due to diffraction of light by
water droplets.
 Ans: Altostratus.
 Q.158……… clouds sometimes referred as sheep clouds
or wool pack clouds.
 Ans: Alto cumulus.
 Q.159. Streaks of water or snow falling from
Nimbostratus clouds but not reaching the ground are
called ………..
 Ans: Virga.
 Q.160………… clouds are formed due to flattening of
cumulus clouds.
 Ans: Stratocumulus.

37.  Q.161. Specific heat of water is …………
 Ans: 1cal/cm3.
 Q.162. Specific heat of soil is ……………
 Ans.0.34 cal/cm3.
 Q.163………… state receives most rainfall in N-E
Monsoon.
 Ans: Tamilnadu.
 Q.164. During south west monsoon, India receives………
% of annual rainfall.
 Ans: 70-80.
 Q.165……… state is called as gateway of Indian monsoon.
 Ans: Kerala

38.  Q.166. Drainage is measured with…………
 Ans: Lysimeter.
 Q.167………… light is the most effective inhibitor of
flowing in the case of long day plants.
 Ans: Red.
 Q.168 ………… light helps mature apples to turn red.
 Ans: Red.
 Q.169. Stem elongation is promoted by exposure to ………
wave lengths.
 Ans: Far red.
 Q.170. PAR (Photo Synthetically Active Radiation) is
measured by ………..
 Ans: Silicon photovoltaic detector.

39.  Q.171. The Optimum temperature for plants are
between ………
 Ans: 18.30C to 23.90C.
 Q.172. Cotton is a …………… day plant.
 Ans: Short.
 Q.173. Barley is a ………… day plant.
 Ans: Long.
 Q.174. Rice is a …………… day plant.
 Ans: Short.
 Q.175. Tomatoes grows faster when the temperature is
…… 0C by day and …… 0C by night.
 Ans: 26 and 17.

40.  Q.176. Threshold temperature for wheat is ……
 Ans: 4.40C.
 Q.177. Threshold temperature for rice is …………
 Ans: 10-120C.
 Q.178. Threshold temperature for tobacco is ………
 Ans: 13-140C.
 Q.179. The global renewable water supply is about
………… m3 per person per year.
 Ans: 7000.
 Q.180 ……… is a substance that has crystal properties
similar to those of ice.
 Ans: AgI(Silver Iodide).

41.  Q.181. NCMRWF Stands for………………
 Ans: National Centre for Medium Range Weather
Forecasting.
 Q.182. Wind velocity is higher when ………… is higher.
 Ans: Evaporation.
 Q.183. Higher the relative humidity, lower the rate of ….
 Ans-Evaporation
 Q.184 ………… gas causes chlorosis is plants.
 Ans: SO2.
 Q.185. An average human requires about ……… kg of air
each day.
 Ans: 12.

42.  Q.186. Particulates suspended in air is called as ……………
 Ans: Aerosols.
 Q.187. Aerosol consisting of liquid droplets is called as ………
 Ans: Mist.
 Q.188. Wind speed is a ……… quantity.
 Ans: Scalar.
 Q.189. Wind velocity is a ………… quantity.
 Ans: Vector.
 Q.190. Instantaneous physical state of atmosphere is called
as
 Ans: Weather.
 Q.191. Generalized physical state of atmosphere is called as
…
 Ans: Climate.

43.  Q.192. AICRPAM Stands for …………….
 Ans: All India Coordinated Research Project on
Agrometeorology.
 Q.193. 10= …… minutes.
 Ans: 4.
 Q.194. Accuracy of ordinary rain gauge is ……………
 Ans: ±0.2mm.
 Q.195……… is used to measure reflected solar radiation
from crop and other surfaces.
 Ans: Albedo meter.
 Q.196. Sensor used in albedometer is …………
 Ans: Thermopile

44.  Q.197……… is used to measure global diffuse and direct
radiation.
 Ans: Pyrheliometer.
 Q.198 ……… is used to measure overall net radiation.
 Ans: Net radiometer.
 Q.199 ………… is used to measure heat conducted inside
the soil.
 Ans: Soil heat flux plate.
 Q.200. Sensor used in quantum sensor is ……………
 Ans: Photodiode.
 Q.201……… is used to measure depth of water table.
 Ans: Piezometer.
 Q.202 …………. is used to measure water stress in soil.
 Ans: Tensiometer.

45.  Q.203. Coriolis force is zero over …………
 Ans: Equator.
 Q.204. The atmosphere after absorbing the long wave
radiation also radiates some portion of it back to the
earth is called ………
 Ans: Counter Radiation.
 Q.205. At what height atmospheric pressure is half the
sea level value?
 Ans: 12 km.
 Q.206. Wind direction is deflected from its normal course
due to …………
 Ans: Coriolis force.

46.  Q.207. The speed of storm is ……… km/h.
 Ans: 100-120.
 Q.208. On which date day is longest in northern hemisphere?
 Ans: 21stJune.
 Q.209. On which date night is longest in northern hemisphere?
 Ans: 22nd December.
 Q.210. The height of the low cloud extends up to ………
 Ans: <2km.
 Q.211. The ultra violet radiation is strongly absorbed by ………
 Ans: Ozone (O3).
 Q.212. The short-range forecasting is valid for ………… days.
 Ans: 1-3.
 Q.213. The medium range forecast is valid for ………
 Ans: 3-10days.

47.  Q.214. Moisture availability index was first introduced by
 Ans: Hargreaves.
 Q.215. The ratio between water deficit and water need is
known as …….
 Ans: Aridity Index.
 Q.216. Most of the tropical plants are ……… day plants.
 Ans: Short.
 Q.217. The vapour pressure is higher during ………
 Ans: Morning.
 Q.218. Heat transfer through mass motion is known as …
 Ans: Convection.
 Q.219. GDD is an index of ………….
 Ans: Thermal requirement

48.  Q.220. Meteorological drought is mainly classified on the
basis of ………..
 Ans: Rainfall.
 Q.221. Bowen ratio (β) is the ratio of ……………
 Ans: Sensible heat to latent heat.
 Q.222. Surface boundary layer extends up to a height
of…………
 Ans-50 to 100m.
 Q.223. The wind structure of surface boundary layer is
governing by…………….
 Ans: Surface characteristics.
 Q.224. The weather of surface boundary layer is known
as ………..
 Ans: Micro weather.

49.  Q.225. The thickness of planetary boundary layer is …
 Ans: 100 to 1000m.
 Q.226. SDD stands for ……………
 Ans: Stress Degree Day.
 Q.227. The productivity of wheat crop increases with ……
 Ans: Latitude.
 Q.228. In general the % conversion of solar energy into
dry matter in case of wheat crop is………
 Ans: 1%.
 Q.229. The point at which respiration rate is equal to the
photo synthesis rate is …………..
 Ans: Compensation point.

50.  Q.230. About how much of water in needed to produce 1
kg of wheat?
 Ans: 1000kg.
 Q.231. The type of weather forecasting mainly useful for
agricultural operations is ……………
 Ans: Medium Range.
 Q.232. Unit of heat use efficiency is …………
 Ans: kg/ha/degree day.
 Q.233. The microclimate just above a crop and within the
canopy is known as …………
 Ans: Eco Climate.
 Q.234. Most of the temperate crops are ………… day
plants.
 Ans: Long.

51.  Q.235. Climate Classification was first done by ………
 Ans: Decandole.
 Q.236. Infrared thermometer is used to measure ……
 Ans: Canopy Tem
 Q.237. The instrument used to measure altitude of
various points is …………
 Ans: Hypsometer.
 Q.238. The space tool used for detecting tropical cyclone
is ……….
 Ans: Radar.
 Q.239. Steady state porometer is used to measure ………
 Ans: Transpiration perature.

52.  Q.240. Leaf area meter measures ………….
 Ans: Leaf Area Index (LAI).
 Q.241. The cup of anemometer rotates ……………
 Ans: West to east.
 Q.242. Cup counter anemometer is used for measuring …
 Ans: Horizontal wind speed.
 Q.243. Human hair is most sensitive to …………
 Ans: Humidity.
 Q.244. When dry bulb and wet bulb temperature are
equal, relative humidity is ……………
 Ans: 100%.
 Q.245. During winter which type of cards are used in
sunshine recorder?
 Ans: Short curved cards.

53.  Q.246. The first meteorological satellites were launched
in the year …………..
 Ans: 1960.
 Q.247. Who first measured the velocity of Light?
 Ans: Romer.
 Q.248. World meteorological day is celebrated on ……
 Ans: 23 march.
 Q.249. World environment day is celebrated on ………
 Ans: 5th June.
 Q.250. The space application centre (SAC) is located at …..
 Ans: Ahmedabad.
 Q.251. According to NARP, the number of agro climatic
zones in India are …….
 Ans: 127.

54.  Q.252. According to IMD, the number of meteorological
sub division in India are ……………..
 Ans: 35.
 Q.253. Who was discovered the concept of potential
evapotranspiration?
 Ans: C.W Thornthwaite.
 Q.254. ICRISAT was started during the year…………
 Ans: 1975.
 Q.255. The Indian institute of tropical meteorology
(IITM) is located at …………
 Ans: New Delhi.

55.  Q.256. Father of agro climatology is ………..
 Ans: Koppen.
 Q.257. The mean surface temperature of the earth is …
 Ans: 3000k.
 Q.258. The radiation from sun scattered by the air and
dust molecules is known as ……….
 Ans: Sky radiation.
 Q.259. A remote sensing sensor records which energy?
 Ans: Reflected energy.
 Q.260. The remote sensing systems which provide their
own source of illumination are known as ………….
 Ans: Active sensors.

56.  Q.261. The sensors which measure the naturally
available energy are called as …………
 Ans: Passive Sensors.
 Q.262. The study of upper part of the atmosphere is
known as ………
 Ans: Aeronomy.
 Q.263………… gas influences atmospheric temperature.
 Ans: CO2.
 Q264. …………. are the agents for reflection and
scattering in the atmosphere.
 Ans: Dust particles.

57.  Q.265. Most of the weather phenomena occurs in …………
layer of atmosphere.
 Ans: Troposphere.
 Q.266. The temperature is almost constant in ………….
space.
 Ans: Stratosphere.
 Q.267. The transition zone between troposphere and
stratosphere is known as ………..
 Ans: Tropopause.
 Q.268. The transition zone between stratosphere and
mesosphere is known as ……..
 Ans: Stratopause.
 Q.269. Thetransition zone between mesosphere and
thermosphere is known as ……………
 Ans: Mesopause.

58.  Q.270. In …… sphere the temperature increases rapidly
with height.
 Ans: Thermosphere.
 Q.271. The day and night are caused due to …….. of the
earth.
 Ans: Rotation.
 Q.272. The earth is closest to the sun on ……… every
year is known as ………
 Ans: Jan 3, Perihelion.
 Q.273. The equinoxes falls on ………… and ………… every
year on earth.
 Ans: Sept-23rd and March 21st.

59.  Q.274. The solstices falls on ……… and ……… every year
on earth.
 Ans: Dec22nd and June 21st.
 Q.275. The equatorial region is a …… pressure area.
 Ans: Low.
 Q.276. Polar region is a ………… pressure area.
 Ans: High.
 Q.277……… has two maxima and two minima.
 Ans: Pressure.
 Q.278. The thickness of skin layer is ………
 Ans: Few mm to 1.5mm.

60.  Q.279……… of the leaf is directly related to its
chlorophyll content.
 Ans: Transmissibility.
 Q.280 ………… is the most important factor affecting crop
production and distribution.
 Ans: Rainfall.

61. TRUE OR FALSE-
 Q.281. Ozone is the predominant gas in the atmosphere.
(F)
 Correct Answer-Nitrogen.
 Q.282. The distance between the sun and the earth is
farthest on about January 4. (False)
 Correct Answer-July 4.
 Q.283. The position of earth nearest to the sun is
described as Aphelion. (F)
 Correct Answer-Perihelion.
 Q.284. Topography influences the temperature on local
scale. (T)

62.  Q.285. Albedo affects vertical temperature at the
surface. (T)
 Q.286. Stable air masses are extremely cold in middle
latitude. (T)
 Q.287. Coriolis force reduces the speed of the wind. (F)
 Correct Answer-Frictional force.
 Q.288. Gujarat state receives rains due to south west
monsoon only. (T)
 Q289. Latent heat in water vapour is important for the
circulation in the atmosphere.(T)
 Q.290. Dew is the source of water in arid region. (T)
 Q.291. Frost is a form of condensation. (F)
 Correct Answer-Sublimation.

63.  Q.292. Line joining places of equal cloud over a map is
known as isobar. (F)
 Correct Answer-Isoneph.
 Q.293. The annual rainfall over semi-arid regions range
from 1000 to 1500 mm. (F)
 Correct Answer- 250-500mm.
 Q.294. Local forecasts are most useful to aviation
services. (T)
 Q.295. Duration of light accelerates the flowering of
cryophytes. (T)
 Q.296. High maximum temperature decreases the
saturation deficit of the plants. (F)
 Correct Answer-Increases

64.  Q, 297. Presence of radiation is essential to maintain
turgidity in plant. (F)
 Correct Answer-Water
 Q.298. High winds causes lodging of plants. (T)
 Q.299. Net radiation is negative during day time. (F)
 Correct Answer-Night Time
 Q.300. Albedo affects the solar radiation leaving the
surface. (T)